<html>
    <head>
        <meta charset="utf-8">
        <title>我的博客</title>
        <link rel="stylesheet" href="index.css">
    </head>
    <body>
        <h1>Welcome</h1>
        <ul class="nav">
            <li>h
                <div class="subMenu" >
                    This is submenu
                </div>
            </li>
            <li>h</li>
            <li>h
                <div class="subMenu">
                    This is submenu
                </div>
            </li>
            <li>h</li>
            <li>h</li>
        </ul>
    </body>
</html>